From the 1940’s until the early 1980’s, Diamond Hill was once known as Ski Valley. Over the years the skiing stopped and the property became a town park. The hill, with a summit of 481 feet above sea level, offers several miles of trails. Just recently trails have been blazed and navigation is much easier. There are some rather steep inclines to the top of the hill, but for this hike, the route chosen is likely the most gradual. The route also closely follows what is known as the Diamond Hill Park Trail on most GPS maps and Google Maps. Starting from the gravel parking area follow the paved road to the north of the bandstand area. Just beyond the cul-de-sac is a short section of roadway that dead ends to the right of a block building. This is where the yellow blazed trail begins. For this hike follow the yellow blazed trail up to the water tanks. Along the way, the Warner Trail joins and follows part of the yellow trail up to the summit. When you reach the water tanks there are a couple trails to your right that lead you to the summit. In months when there are no leaves and the skies are clear, you will be able to see the Boston skyline and Mount Wachusett. After checking out the summit return to the yellow blazed trail by the water tank. There is construction of a new water tank, so the yellow trail has been rerouted to follow along the west side of the old “Ski Valley” water tank. Shortly and to the right you will see green blazes. Follow them to begin your descent down the hill. The trails the remainder of the way can be quite rocky. Use caution. Continue to follow the green blazed trail after it crosses the red blazed trail. The green trail will end at the blue blazed trail where you want to turn left. The blue trail in turn ends at the (sporadically) white blazed Warner Trail. Stay to the right here and continue downhill. At the bottom of the hill there is a sharp hairpin turn to the right where the trail levels out. Along this stretch you will catch glimpses of the massive rock wall to your right and several small caves. Ahead on the left is the orange trail. You will want to follow the orange trail as it hugs the shoreline of Sylvys Brook. The orange blazed trail exits near the bottom of the former ski-slope. From here veer to your left and back to the parking area.